diff --git a/.github/workflows/validate-frontmatter.yml b/.github/workflows/validate-frontmatter.yml
index bb4a58d..211759b 100644
--- a/.github/workflows/validate-frontmatter.yml
+++ b/.github/workflows/validate-frontmatter.yml
@@ -31,8 +31,8 @@ jobs:
     name: Frontmatter SEO check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: "20"
       - name: Run frontmatter validator